Example for Set Datapoint and Get Datapoint Value Control

Get datapoint value control uses "Get service" to retrieves one or more datapoint values and returns their current values as obtained from the edge device rather than relying on a “last known good” value stored somewhere.

This example shows the setting of datapoint value control (Write Request) and Get datapoint value control (Read Request).

The sequence of operations is as follows and as described on this page:

Modbus device creation and provisioning
Write request (Set datapoint value)
Read Request (Get datapoint value using Get service)

1. Modbus Device Creation and Provisioning

To perform get/set datapoint operation device needs to be provision. After successful provisioning device is fully operational and we can get/set datapoint values.

Request: Modbus Create
mosquitto_pub -t glp/0/T6tWyga/rq/dev/modbus/amik_rtu/do -m '{"action":"create","args":{"unid":"01:1","type":"9FF4A2150040DB00"}}' mosquitto_pub -t glp/0/T6tWyga/rq/dev/modbus/amik_rtu/cfg -m '{"name":"rv-test-cfg","desc":"description","loc":{"desc":"","lat":27.68353,"lng":76.64063,"ele":null}}'

Response: Modbus Create
glp_mqtt_publish MQTT Publishing, time: 1552976570 sec Topic: glp/0/T6tWyga/fb/dev/modbus/amik_rtu/sts Data: {"state":"unprovisioned","unid":"01:1","health":"normal","cat":"i/o","type":"9FF4A2150040DB00","interfaceType":"static","usage":"controller","version":"AMIK 201 Series Digital Power M","product":"AMIK201RTU","manufacturer":"Simpson Electric","mru":"2019-03-19 06:22:50.000 UTC"}

Request: Provisioning
mosquitto_pub -t glp/0/T6tWyga/rq/dev/modbus/amik_rtu/do -m '{"action":"provision"}'

Response: Provisioning

Response: Provisioning

Type objects:
Topic: glp/0/T6tWyga/fb/res/type/blk.9FF4A2150040DB00/1 
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Topic: glp/0/T6tWyga/fb/res/type/blk.9FF4A2150040DB00/2 
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Topic: glp/0/T6tWyga/fb/res/type/blk.9FF4A2150040DB00/3 
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Topic: glp/0/T6tWyga/fb/res/type/blk.9FF4A2150040DB00/4 
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Interface objects:
Topic: glp/0/T6tWyga/fb/dev/modbus/amik_rtu/if/block/1 
Data: {"type":"blk.9FF4A2150040DB00/1","Volts_1":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_volt_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Freq":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_freq_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"mru":"2019-03-19 06:23:05.000 UTC"}

Topic: glp/0/T6tWyga/fb/dev/modbus/amik_rtu/if/block/2 
Data: 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07:30:50.000 UTC"}


Topic: glp/0/T6tWyga/fb/dev/modbus/amik_rtu/if/block/3 
Data: {"type":"blk.9FF4A2150040DB00/3","Demand_Reset":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_switch","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Demand_Period":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_time_mi","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Energy_display_on_modbus":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"mru":"2019-03-19 06:58:27.000 UTC"}

Topic: glp/0/T6tWyga/fb/dev/modbus/amik_rtu/if/block/4 
Data: {"type":"blk.9FF4A2150040DB00/4","Sys_Voltage":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_volt_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Sys_Current":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_amp_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Sys_Type":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Pulse_Width":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Energy_Reset":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_switch","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Run/On_Hour_&_Interruption_Reset":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_switch","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"RS_485_Set-up_Code":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Node_Address.":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Pulse_Divisor":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Min_Reset":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Max_Reset":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"PT_Primary":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"CT_Primary":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"System_Power":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_power_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Energy_Digit_reset_count":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_i","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Register_Order/Word_Order":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_switch","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"CT_Secondary":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"PT_Secondary":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Relay_Output_Select":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Pulse/Limit_Paramter_Select":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Limit_Trip_point":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Hysteresis":{"cat":"out","property":false,"type":"0000000000000000-0/SNVT_count_f","value":0,"monitor":{"rate":0,"cat":"data","inFeedback":true,"report":"change","throttle":0},"values":{"level":17,"levels":{"17":0}}},"Limit_Delay(On)":{"cat":"out","property":false,"type":"0000000000000000-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06:58:27.000 UTC"}

2. Write request: (Set Datapoint Value)

Set datapoint value request will be initiated by User/CMS. This request will be sent to the Modbus engine, to change the value of datapoint "Demand_Reset" which belongs to interface block number 3 of amik_rtu modbus device.

User Request
mosquitto_pub -t glp/0/T6tWyga/rq/dev/modbus/amik_rtu/if/block/3/Demand_Reset/value -m 50

Request to Control Service

The Modbus engine will send the same request to control service.

Request to Control Service

Topic: glp/0/./=control/service 
Data:
{
  "datapoint": {
    "value": 50
  },
  "request": "glp/0/T6tWyga/rq/dev/modbus/amik_rtu/if/block/3/Demand_Reset",
  "respond": "glp/0/./=engine/modbus/dvc/respond",
  "meta": "glp/0/T6tWyga/rq/dev/modbus/amik_rtu/if/block/3/Demand_Reset"
}

Response from Control Service

Control service will update the priority level values and send the updated object to the Modbus engine.

  "datapoint": {
    "values": {
      "levels": {
        "17": 50
      },
      "inactive": {},
      "level": 17
    }
  },
  "meta": "glp/0/T6tWyga/rq/dev/modbus/amik_rtu/if/block/3/Demand_Reset"
}

Updated Values

This is the final step of setting the datapoint value. The Modbus engine will return a response on the feedback channel.

Updated Values

Topic: glp/0/T6tWyga/fb/dev/modbus/amik_rtu/if/block/3 
Data:
{
  "type": "blk.9FF4A2150040DB00/3",
  "Demand_Reset": {
    "cat": "out",
    "property": false,
    "type": "0000000000000000-0/SNVT_switch",
    "value": 50,
    "monitor": {
      "rate": 0,
      "cat": "data",
      "inFeedback": true,
      "report": "change",
      "throttle": 0
    },
    "values": {
      "level": 17,
      "inactive": {},
      "levels": {
        "17": 50
      }
    }
  },
  "Demand_Period": {
    "cat": "out",
    "property": false,
    "type": "0000000000000000-0/SNVT_time_mi",
    "value": 0,
    "monitor": {
      "rate": 0,
      "cat": "data",
      "inFeedback": true,
      "report": "change",
      "throttle": 0
    },
    "values": {
      "level": 17,
      "levels": {
        "17": 0
      }
    }
  },
  "Energy_display_on_modbus": {
    "cat": "out",
    "property": false,
    "type": "0000000000000000-0/SNVT_count_f",
    "value": 0,
    "monitor": {
      "rate": 0,
      "cat": "data",
      "inFeedback": true,
      "report": "change",
      "throttle": 0
    },
    "values": {
      "level": 17,
      "levels": {
        "17": 0
      }
    }
  },
  "mru": "2019-03-19 07:36:49.000 UTC"
}

3. Read Request (Get Datapoint Value Using Get Service)

User/CMS request for get datapoint value to Get service.

Request from user/cms to "Get" service
mosquitto_pub -t glp/0/./=get/dp/request -m '{"corr":"abcd","response":"my/responses","item":["dev/modbus/amik_rtu/if/phase/3/Demand_Reset","dev/modbus/amik_rtu/if/phase/3/Demand_Period"],"maxAge":1,"timeout":10}'

Get service will send the same request to Modbus engine.

Request from "Get" service to modbus engine

Topic : glp/0/./=engine/modbus/rq/poll/dev/modbus/amik_rtu/if/phase/3/Demand_Reset
Message : {"corr":"abcd","respond":"glp/0/./=engine/modbus/fb/poll/dev/modbus/amik_rtu/if/phase/3/Demand_Reset/3b57bd4c6346986b94c21e75aecdf2da","timeout":10}

Topic : glp/0/./=engine/modbus/rq/poll/dev/modbus/amik_rtu/if/phase/3/Demand_Period
Message : {"corr":"abcd","respond":"glp/0/./=engine/modbus/fb/poll/dev/modbus/amik_rtu/if/phase/3/Demand_Period/3b57bd4c6346986b94c21e75aecdf2da","timeout":10}

The Modbus engine will respond to the Get service with current value of that datapoint.

Response from modbus engine to "Get" service

Topic: glp/0/./=engine/modbus/fb/poll/dev/modbus/amik_rtu/if/phase/3/Demand_Reset/3b57bd4c6346986b94c21e75aecdf2da
Data: {"corr":"abcd","value":50}

Topic : glp/0/./=engine/modbus/rq/poll/dev/modbus/amik_rtu/if/phase/3/Demand_Period
Message : {"corr":"abcd","respond":"glp/0/./=engine/modbus/fb/poll/dev/modbus/amik_rtu/if/phase/3/Demand_Period/3b57bd4c6346986b94c21e75aecdf2da","timeout":10}

Get service will respond to USER/CMS on the same topic which was mentioned in the Get datapoint request object.

Response from "Get" service to user/cms
mosquitto_sub -t my/responses {"corr":"abcd","result":[{"item":"dev/modbus/amik_rtu/if/phase/3/Demand_Reset","value":50},{"item":"dev/modbus/amik_rtu/if/phase/3/Demand_Period","value":0}]}